/*
 * Copyright (c) 2023 DuckDuckGo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.duckduckgo.savedsites.api.models

class TreeNode<T>(val value: T) {

    private val children: MutableList<TreeNode<T>> = mutableListOf()
    fun add(child: TreeNode<T>) = children.add(child)
    fun isEmpty() = children.isEmpty()

    fun forEachVisit(
        visitBefore: Visitor<T>,
        visitAfter: Visitor<T>,
    ) {
        visitBefore(this)
        children.forEach {
            it.forEachVisit(visitBefore, visitAfter)
        }
        visitAfter(this)
    }
}

typealias Visitor<T> = (TreeNode<T>) -> Unit
